Procedure a DC analysis 1 Construct the circuit in Fig 2 2 Measure all Dc

Procedure a dc analysis 1 construct the circuit in

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Procedure a. DC analysis 1. Construct the circuit in Fig. 2 2. Measure all Dc values and fill out Table – 2 3. Apply 4V peak to peak 1kHz sinewave to the input Vin in Fig.2 4. Display Vin, Vout1, Vin and Vout2 with the oscilloscope
5. Compute both voltage gains 6. Record the phase shift b. AC Analysis for Common Emitter (CE) Amplifier 1. Construct the circuit in Fig. 3 2. Apply a sinusoidal input signal with 100mV peak to peak and 4kHz 3. Measure vs, vx and vout 4. Measure the peak to peak of the maximum output voltage 5. Decrease the frequency and record values for Vout 6. Determine frequency at the lower 3dB point 7. Determine frequency at the upper 3dB point 8. Determine bandwidth 9. Computer Ri, voltage gain and bandwidth of the CE amplifier 10. Remove the 46uF capacitor 11. Measure voltage gain 12. Measure bandwidth Results and Discussion a. DC Analysis Table – 2 VCE (V) VBE (V) VB (V) IC (mA) IE (mA) IB (mA) 7.48 0.64 4.53 0.821 0.812 0.006 The values of table 2 and table 1 (theoretical table) are similar. The difference in the values can be due to the precision of the equipment used during the lab and small manipulation errors. Beta=IC/IB=0.821m/0.006m=136.83
Vout1/Vin=4.15V/4.23=0.981V/V Vout2/Vin=Vout1/Vin=0.981V/V Both gains are approximately 1 which is close to the theory value. Also, since both gains are the same, this means that there is no phase shift.

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